noun
A mythological creature (usually humanoid and undead) said to feed on the blood or life energy of the living.
(colloquial, usually humorous) A person with habits traditionally ascribed to (literal) vampires, such as heliophobia, being a night owl, having pale skin, and so on.
(colloquial, disrespectful) A person with the medical condition porphyria cutanea tarda, colloquially known as vampirism, with effects such as photosensitivity and brownish-red stained teeth.
A blood-sucking bat; vampire bat (Desmodus rotundus)
(figurative, derogatory) A person who drains one's time, energy, money, etc.
(dated) A vamp: a seductive woman who exploits men.
(US, slang) A medical technician who works with patients' blood; especially, a phlebotomist.
(US naval jargon) Synonym of anti-ship missile (ASM), particularly an incoming hostile one.
verb
(transitive, figurative) To drain of energy or resources.